A thermodynamic system undergoes a cyclic process as shown in the figure (Figure

ID: 1488192 • Letter: A

Question

A thermodynamic system undergoes a cyclic process as shown in the figure (Figure 1) . The cycle consists of two closed loops, loop I and loop II.

a)Over one complete cycle, does the system do positive or negative work?

b)In the loop I, is the net work done by the system positive or negative?

c)In the loop II, is the net work done by the system positive or negative?

d)Over one complete cycle, does heat flow into or out of the system?

e)In the loop I, does heat flow into or out of the system?

f)In the loop II, does heat flow into or out of the system?

a) Positive

because workdone by the gas > workdone on gas

b) positive

because workdone by the gas in loop1 > workdone on gas

c) negative

because workdone by the gas in loop2 < workdone on gas

d) into the system

in a comolete cycle, dU = 0

so, dQ = dU + dW

dQ = dW

here, dW is positive.so dQ is also positive.

e) into the system

in the loop1, dU = 0

so, dQ = dU + dW

dQ = dW

here, dW is positive.so dQ is also positive.

f) out of the system

in the loop2, dU = 0

so, dQ = dU + dW

dQ = dW

here, dW is negative.so dQ is also negative.

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